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Date: Mon, 05 Jan 2004 05:39:50 GMT
From: Harvey White <madynnopsametcom.com>
Subject: Re: battery electrolyte level test - how to ?


On Mon, 05 Jan 2004 04:26:47 +0000, tom <testnopsamam.com> wrote: >(following from previous dead battery post - but maybe diff. enuf to merit >new thread) >1. how can I measure the levels of each cell ? other than trying to find the connections between cells, the usual method is to measure the specific gravity of the cell. >2. what am I measuring - voltage? sulphiric acidness ? Sg, concentration of sulfuric acid = charge state. >3. when I get a result: whats good ? whats bad ? Look at the little red and green markings on the hydrometer. >4. how do I know if i need to top up with sulphuric acid ? you normally don't, if the battery is in decent shape. However, adding some can help a bit. >BYW: my dead bettery is currently charging, now its 7.59 volts; its >gonna be interesting to see how it goes. Normal voltage on lead-acid cells is 2.0 (1.9 or so is recharge) at low level. Normal float voltage (nominal car voltage) is 2.3 volts (13.8 volts). Charging voltage should not go above about 2.6 volts/cell.... These voltages are approximate. If your battery is toast, then it will go above 14 to 15 volts and you will draw very little current in charging, one cell (or many of them) will show more than about 2.4 volts (like 3 or 4 volts) on charge... Hope that this helps a bit Harvey >thanks, tom

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